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William Blair & Company Portfolio holdings
AUM
$34.9B
1-Year Est. Return
18.88%
This Fund
S&P 500
This Quarter
Est. Return
-3.16%
1 Year Est. Return
+18.88%
3 Year Est. Return
+73.84%
5 Year Est. Return
+90.13%
10 Year Est. Return
+512.03%
AUM
$34.9B
AUM Growth
-$2.36B
(-6.3%)
Cap. Flow
-$465K
Cap. Flow
% of AUM
-0%
Top 10 Holdings %
Top 10 Hldgs %
25.64%
Holding
2,019
New
132
Increased
799
Reduced
746
Closed
97
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
Invesco S&P 500 Equal Weight ETF
RSP
|
+$224M |
| 2 |
Vanguard FTSE All-World ex-US ETF
VEU
|
+$113M |
| 3 |
Quanta Services
PWR
|
+$75M |
| 4 |
SPDR Gold Trust
GLD
|
+$58.9M |
| 5 |
Boeing
BA
|
+$55.5M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Workday
WDAY
|
+$91.2M |
| 2 |
CWAN
Clearwater Analytics
CWAN
|
+$78M |
| 3 |
Applovin
APP
|
+$74.7M |
| 4 |
Tyler Technologies
TYL
|
+$69.1M |
| 5 |
Uber
UBER
|
+$62.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 21.79% |
| 2 | Industrials | 14.2% |
| 3 | Financials | 12.26% |
| 4 | Healthcare | 10.59% |
| 5 | Consumer Discretionary | 7.17% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
601
JPMorgan Nasdaq Equity Premium Income ETF
JEPQ
$37.9B
| $3.31M | 0.01% |
59,567
-14,415
| -19% | -$834K |
|
602
C.H. Robinson
CHRW
$20.5B
| $3.3M | 0.01% |
19,876
-740
| -4% | -$132K |
|
603
Affiliated Managers Group
AMG
$9.51B
| $3.29M | 0.01% |
11,883
+1,159
| +11% | +$349K |
|
604
Old Second Bancorp
OSBC
$1.29B
| $3.28M | 0.01% |
162,883
+8,664
| +6% | +$174K |
|
605
Best Buy
BBY
$19B
| $3.27M | 0.01% |
50,914
+4,026
| +9% | +$264K |
|
606
Kadant
KAI
$3.58B
| $3.26M | 0.01% |
11,143
-141
| -1% | -$45.3K |
|
607
iShares S&P Mid-Cap 400 Growth ETF
IJK
$10.6B
| $3.26M | 0.01% |
32,350
-1,696
| -5% | -$174K |
|
608
Labcorp
LH
$25.2B
| $3.23M | 0.01% |
12,113
+362
| +3% | +$98K |
|
|
SCHR
609
Schwab Intermediately-Term US Treasury ETF
SCHR
$13.3B
| $3.21M | 0.01% |
128,984
+6,201
| +5% | +$155K |
|
610
Fidelity National Financial
FNF
$14.4B
| $3.2M | 0.01% |
69,090
-1,992
| -3% | -$103K |
|
611
VanEck Morningstar Wide Moat ETF
MOAT
$11.8B
| $3.2M | 0.01% |
33,103
-275
| -0.8% | -$28.5K |
|
612
Canadian National Railway
CNI
$78.5B
| $3.19M | 0.01% |
31,022
-1,927
| -6% | -$199K |
|
613
Strategy Inc
MSTR
$34.1B
| $3.17M | 0.01% |
25,396
+5,734
| +29% | +$820K |
|
614
Consolidated Edison
ED
$41.4B
| $3.16M | 0.01% |
27,936
-351
| -1% | -$38K |
|
615
Parsons
PSN
$4.31B
| $3.15M | 0.01% |
58,161
+25,054
| +76% | +$1.6M |
|
616
Cogent Communications
CCOI
$635M
| $3.14M | 0.01% |
166,521
-11,134
| -6% | -$245K |
|
617
Vanguard Short-Term Inflation-Protected Securities Index Fund
VTIP
$19.1B
| $3.13M | 0.01% |
62,707
-4,549
| -7% | -$226K |
|
618
Alnylam Pharmaceuticals
ALNY
$38.3B
| $3.12M | 0.01% |
9,430
-344
| -4% | -$117K |
|
619
Invesco Aerospace & Defense ETF
PPA
$8.07B
| $3.1M | 0.01% |
18,705
+750
| +4% | +$131K |
|
620
Xcel Energy
XEL
$49.2B
| $3.08M | 0.01% |
38,739
-357
| -0.9% | -$28K |
|
|
WAY
621
Waystar Holding Corp
WAY
$4.7B
| $3.07M | 0.01% |
127,449
-77,419
| -38% | -$2.05M |
|
622
Waters Corp
WAT
$37.3B
| $3.04M | 0.01% |
10,204
+4,379
| +75% | +$1.5M |
|
623
Verra Mobility
VRRM
$775M
| $3.04M | 0.01% |
212,613
-175,132
| -45% | -$3.21M |
|
624
Vanguard Consumer Staples ETF
VDC
$8.16B
| $3.04M | 0.01% |
13,525
-132
| -1% | -$30.2K |
|
625
Acuity Brands
AYI
$9.99B
| $3.02M | 0.01% |
10,788
-410
| -4% | -$125K |
|
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William Blair & Company's Q1 2026 Portfolio in Review
As of Q1 2026, William Blair & Company held 2,019 positions worth $34.9B, down 6.3% from $37.3B the previous quarter. Its ten largest holdings account for 26% of the portfolio.
William Blair & Company's Q1 2026 filing shows 132 new, 799 increased, 746 reduced and 97 closed positions. Its largest new stake was Silicon Motion: 103,179 shares worth $11.6M. The largest sale was Workday, an estimated $91.2M.
By sector, the portfolio is most concentrated in Technology at 22% of assets, down from 26% a quarter earlier, followed by Industrials and Financials.
- William Blair & Company's largest Q1 2026 buy was Silicon Motion: 103,179 shares worth $11.6M.
- William Blair & Company added most to Invesco S&P 500 Equal Weight ETF in Q1 2026, an estimated $224M increase.
- William Blair & Company's biggest Q1 2026 reduction was Workday, cutting an estimated $91.2M.
- William Blair & Company fully exited Dynavax Technologies in Q1 2026, selling an estimated $27.4M.
- William Blair & Company's ten largest holdings make up 26% of its $34.9B portfolio in Q1 2026.
- William Blair & Company opened 132 new positions and closed 97 in Q1 2026.
- William Blair & Company's portfolio value fell 6.3% quarter-over-quarter to $34.9B.
Based on William Blair & Company's 13F filing for Q1 2026, filed 8 May 2026.